The message k
from Sacha contains these words:

In the last month I have had 3 emails returned as undeliverable, even though
the addresses to which I am replying are not spam-trapped (apparently) I
am using 'reply', too, not 'compose', so I don't understand this and it's
not a problem I've had before. Has anyone any ideas as to why it's
happening? I'm using Apple's own email program for my iMac.

Probably because something in your subject line triggers a spam filter.
(Like "HELLO!" for instance.)

--
Rusty
horrid dot squeak snailything zetnet point co full-stop uk
http://www.users.zetnet.co.uk/hi-fi/